Posted by **Judy and group** on Thursday, April 1, 2010 at 4:45am.

8-A bakery stated that the average number of breads sold daily is 3000. An employee thinks that the actual

value might differ from this and wants to test this statement. The correct hypotheses are:

(1) H0 : ¦Ì = 3000 H1 : ¦Ì not= 3000

(2) H0 : ¦Ì > 3000 H1 : ¦Ì ¡Ü 3000

(3) H0 : ¦Ì = 3000 H1 : ¦Ì = 3000

(4) H0 : ¦Ì > 3000 H1 : ¦Ì not= 3000

(5) H0 : ¦Ì ¡Ü 3000 H1 : ¦Ì > 3000

ANSWER: 1

9-A statistics practitioner formulated the following hypothesis: H0 : ¦Ì = 200 against H1 : ¦Ì < 200 and

learned that x = 190 n = 9 and ¦Ò = 50.

The p¨C value of the test is

(1) 0.6

(2) 0.2743

(3) 0.7743

(4) −0.2743

(5) Cannot be found with information given

ANSWER: 5 (we need the level of significance)

10-In a sample of 500 college students fifty percent of all college students attend schools within 50 miles of

their homes.

The probability that the population proportion will be between 0.45 and 0.55 is

(1) 0.4875

(2) 0.9818

(3) 0.4909

(4) 0.9750

(5) 0.5000

answer: 4

11-Suppose the mass of college students can be modeled by the normal distribution. We believe the mean

of the normal distribution is 72 kg. We randomly sample 18 students and find an average of 69 kg and a

standard deviation of 4kg.

A. The standard error of ¦Òx is 0.9428

B. A t-statistic can be calculated and it is equal to −3.18

C. The degrees of freedom for the t-distribution will be 17

The correct statement(s) is(are)

(1) Only A

(2) All three statements are correct.

(3) B and C

(4) A and B

(5) A and C

ANSWER: 5

- stats -
**PsyDAG**, Thursday, April 1, 2010 at 10:44am
I don't know if your symbol stands for the mean. You can use μ, if you can copy and paste this symbol. Otherwise, it might be better to print out "mean."

8. Correct

9. I don't know what you mean by the "p¨C value."

11. Correct

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